不知道为什么本地运行会卡死，但提交上去可以AC，经过排查问题出在BFS这个函数在本地似乎无法正常返回，有没有大佬帮忙看看。

#include <bits/stdc++.h>
#include <unordered_map>
using namespace std;
const int maxn = 1e3 + 5;
#define lowbit(x) ((x)&(-x))
vector<int> v(maxn),ans;
int n;
struct node
{
	node *left, *right;
	int num;
	node() :left(nullptr), right(nullptr){}
	node(int _num) :num(_num){}
};
int count(int no)
{
	if (no > n)
		return 0;
	return count(no * 2) + count(no * 2 + 1) + 1;
}
void creat_tree(node *&t,int low, int high,int no)
{
	if (no > n)
		return;
	int left_num = count(no * 2);
	t = new node(v[low+left_num]);
	creat_tree(t->left,low, low + left_num - 1, no * 2);
	creat_tree(t->right,low + left_num + 1, high, no * 2 + 1);
}
void BFS(node *t)
{
	queue<node *> q;
	q.push(t);
	int cnt = 0;
	while (!q.empty())
	{
		auto top = q.front();
		q.pop();
		ans.push_back(top->num);
		//cnt++;
		//cout << top->num;
		//if (cnt < n)
			//cout << " ";
		if (top->left != nullptr)
			q.push(top->left);
		if (top->right != nullptr)
			q.push(top->right);
	}
}
int main()
{	
	cin >> n;
	for (int i = 0; i < n; i++)
		cin >> v[i];
	sort(v.begin(), v.begin()+n);
	node *t = nullptr;
	creat_tree(t,0, v.size() - 1,1);
	BFS(t);
	for (int i = 0; i < ans.size(); i++)
	{
		cout << ans[i];
		if (i != ans.size() - 1)
			cout << " ";
	}
	return 0;
}